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 Posted: Apr 8, 2022 04:25AM
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To answer your question, Yes, you can drill the holes in the head. The reason for the 2 extra studs is because the 60's Cooper S engines had 200 psi per cylinder. When the Cooper S models were dropped from the line up, there was no need to beef up the 998cc engine.

The timing chain might be contributing to your noise. Worn rocker shaft?

 Posted: Apr 7, 2022 02:07PM
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The rockers are adjusted.  

 Posted: Apr 7, 2022 08:17AM
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Two extra head studs is not going tp make any difference in the noise department. When was the last time the rocker arms were adjusted?

 Posted: Apr 7, 2022 05:15AM
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My head makes quite a bit of rattle at idle (11 stud).  I have and extra head I'm thinking about having rebuilt (9 stud).  Can i just drill the two extra holes in my 9 stud head?  I have set the valves and changed rockers.  Still bit noisier than I think it should be. 
thanks,
steve